Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Source of phosphate for agriculture and the food industry

a technology of phosphate and agriculture, applied in the field of phosphate sources for agriculture and the food industry, can solve the problems of soil permanent contamination, serious environmental damage,

Active Publication Date: 2016-10-13
ECOPHOS
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a method for preparing calcium chloride, calcium sulphate dihydrate, and other compounds with low contents of radioactive elements. The method involves using a phosphate salt with reduced content of radioactive elements, and optionally a secondary phosphate source such as fly ash derived from the incineration of bones, slurry or sludge purification. The phosphate source is digested using a hydrochloric acid solution, and the resulting solution is purified to remove chloride ions to produce phosphoric acid or MCP. The method allows for the preparation of these compounds with low contents of radioactive elements, which can be useful in various applications such as the purification of water and the detection of radioactive elements in samples. The patent also describes the use of geological materials such as fly ash and slurry purification to reduce the radioactive elements in the phosphate source. The contents of radioactive elements in the samples can be determined using gamma ray spectroscopy and alpha-particle spectrometry.

Problems solved by technology

In the field of agriculture, fertilizers are nevertheless compounds that can cause serious damage to the environment, particularly cultivated land.
Given the intensive use of mineral fertilizers to increase supply of nutrients such as nitrogen or phosphorus, soils can be permanently contaminated if these nutrients contain excessive impurities.
The dispersion of these toxic elements in cultivated soils causes sustainable environmental pollution of said cultivated soils.
Excessively high magnesium content in the phosphate source i.e. greater than 1% by weight of magnesium in the phosphate source creates problems for treatment of the attack liquor during the leaching of the phosphate source with an acid.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Source of phosphate for agriculture and the food industry
  • Source of phosphate for agriculture and the food industry
  • Source of phosphate for agriculture and the food industry

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0157]Phosphate ore from North Africa with a P2O5 content of 29% by weight is used. The attack of the ore is performed using an aqueous solution having HCl content by weight of 12% at a temperature of 60° C. The quantity of HCl added is determined by a molar ratio of the HCl added to the ore and the Ca present in it. The attack of the ore is performed at an HCl / Ca ratio of 1.8. The residence time in the attack reactor is 15 minutes. The attack liquor is then transferred to a filter press where the insoluble materials (referred to as residue in Table 1 below) are separated from the aqueous phase. The temperature is maintained at 60° C. for filtration. The solution exiting the filter press is transferred to a neutralisation reactor. Calcium carbonate is added at a Ca / P molar ratio of 1 and a pH of 2.5-3.0. After 45 minutes of reaction and formation of dibasic calcium phosphate (DCP), the neutralised reaction medium is then directed to a band filter. The resulting cake is dried and con...

example 3

[0161]Example 1 is repeated using Syrian ore containing a P205 content of 30.9%. Dibasic calcium phosphate having a P205 content of 42% by weight and calcium content of 27% by weight is obtained. The dibasic calcium phosphate obtained in Example 3 has the same characteristics, in terms of levels of radioactive elements, as the dibasic calcium phosphate of Example 1. Table 2 below details the metallic content in the dibasic calcium phosphate obtained from Example 3. The table also details the metallic contents of a dibasic calcium phosphate described in WO2004 / 002888 produced by a comparative method wherein the steps involving the digestion and filtration of the attack liquor are performed at room temperature.

TABLE 2Metallic content (in ppm) in the dibasic calciumphosphate of Example 3 and in the dibasic calciumphosphate of W02004 / 002888DCP (Ex. 3 -DCPInvention)(comparativeAs1.52.01Ba3.5n.d.Cd0.0960.65Co0.94n.d.Cr6673Cu3.81.3Hgn.d.Mg2023.5Mn3n.d.Mo0.83n.d.Ni2.23.5Pb1.33.7Sr240n.d.Tln...

example 4

Preparation of Single Superphosphate (SSP)

[0163]The dibasic calcium phosphate prepared in Example 1 can be used for the preparation of single superphosphate. The dibasic calcium phosphate was mixed with a sulphuric acid solution (0.5 molar equivalent relative to the quantity of dibasic calcium phosphate) in a double propeller mixer (operation in opposite direction). The single superphosphate (Ca(H2P04)2) obtained with a P205 content between 32 and 37% by weight is dried and sieved. The single superphosphate can be used as such as a fertilizer in a composition intended for agricultural use. The quantity of sulphuric acid may be adapted to form, in the presence of a bulking agent, single superphosphate having a P205 content between 16 to 18%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
temperatureaaaaaaaaaa
Login to View More

Abstract

A source of phosphate for agriculture and food industry comprises a phosphate salt in solid form of formula Mn(HPO4)y.zH2O in which M is Na, K, NH4, n=2, and y=1; or M is Ca, n=1, y=1; or M is Al or Fe, n=2, y=3; and in which z is 0, 1 or 2, wherein said phosphate salt has a phosphate content expressed as a P2O5 content of between 30 and 50% by weight of the phosphate salt, and it has a cadmium content lower than 0.40 ppm.

Description

TECHNICAL DOMAIN[0001]This invention relates to a phosphate salt having high purity, that is to say a low content of impurities, particularly radioactive impurities and / or impurities derived from heavy metals or transition metals of the Periodic Table of Elements. This invention also relates to a process for preparing said phosphate salt and its use in a formulation or a composition intended for agriculture or the food industry or for the preparation thereof. Preferably, said phosphate salt can be used for the preparation of single superphosphate (SSP), triple superphosphate (TSP), monoammonium phosphate (MAP), diammonium phosphate (DAP), phosphoric acid, NPK fertilizer, monocalcium phosphate (MCP) or mono-dicalcium phosphate (MDCP).TECHNOLOGICAL BACKGROUND OF THE INVENTION[0002]Phosphate salts are regularly used in fertilizer compositions such as fertilizers or food compositions in order to facilitate phosphorus dispersion into the soil or into animal or human food respectively.[00...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C05B11/12C01B25/30C01B25/32C01B25/36C05B1/04C01B25/26C01B25/40C05B1/02C05B7/00C01B25/28C01B25/37
CPCC05B11/12C01B25/28C01B25/306C01B25/324C01B25/36C01B25/375A23V2002/00C01B25/40C05B1/02C05B7/00C05B1/04A23L33/16C01P2004/61C01B25/265C01B25/2212C01B25/30C01B25/32C01B25/37
Inventor TAKHIM, MOHAMED
Owner ECOPHOS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com